| Year | 1939 |
| Date | 13-Jul |
| Volume | 81 |
| Issue | 1,992 |
| Page | 52 |
| Category | General |
| Part | |
| Title | A Light Elevating Balance |
| Author | Geo. Gentry |
| Notes | Construction of balance, reference to set of weights. The balance beam, the knife-edges, scale pans and suspension, stirrup |